R ≦ 0.3 , R1 ＝ 0.5

活塞杆表面应作0.8~1.6 μ mRmax (0.2~0.4 μ mRa)的抛光

The reciprocating with dust seal can effectively prevent dust and dirt.
Properties
• Material: TPU
• specific gravity (ASTM D792): 1.20 (D-9), 1.19
• Hardness (ASTM D2240): 95 (D-9): 93
• Tensile strength (ASTM D412): 317 (D-9), 276
• 100% modulus (ASTM D412): 110 (D-9), 100
• 300% modulus (ASTM D412): 170 (D-9), 191
• 70 小时 / 70ºC under compression deformation rate (ASTM D395B): 34 (D-9), 42
• 70 小时 / 100ºC under compression deformation rate (ASTM D395B): 56 (D-9), 56

Working conditions
• Operating speed: 0.03 ~ 0.5 m / sec
• Operating Temperature: -20ºC ~ 100ºC

Oil resistance
• Test oil: wear hydraulic oil 46 #
• Test temperature (ºC): 100
• Test Time (hours): 100
• change in hardness (Shore A): -1 (D-9), 0
• Tensile strength change (%): - 4 (D-9), -5
• Volume change (%): +0.08 (D-9), +0.12